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IEEE Spectrum

Does not quantum compute

Eric Guizzo

Published Jan 1, 2010• 1 citation
Publisher

Abstract

D-wave systems, a Canadian start-up, recently booted up a custom-built, multimillion-dollar, liquid-helium-cooled beast of a computer that it says runs on quantum mechanics.
DOI
10.1109/mspec.2010.5372499

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As she walks around the lab of Rigetti Computing, quantum engineer Sabrina Hong strains to make her voice heard over a loud pumping noise. It’s the heartbeat of helium refrigerators cooling down the Berkeley, California–based start-up’s quantum computers. To perform optimally, these machines need to run below –273.14 °C (10 mK)—colder than outer space. Whoosh, supercold liquid helium is pumped in. Whoosh, warmed helium is pushed out. “I love that sound,” Hong says. It means the company’s two commercial quantum computers are up and running, at the ready for customers. Rigetti and other firms in the quantum computing business, including IBM and Google, allow customers to access their machines over the cloud and perform calculations. The pumping sound also means that the machines are ready for Hong and other engineers on the Rigetti team. She wants to improve quantum computers’ performance and would like to try out some test chips
After a year of outside investigation, questions remain about a controversial quantum computer. When in 1935 physicist Erwin Schrodinger proposed his thought experiment involving a cat that could be both dead and alive, he could have been talking about D-Wave Systems. The Canadian start-up is the maker of what it claims is the world's first commercial-scale quantum computer. But exactly what its computer does and how well it does it remain as frustratingly unknown as the health of Schrodinger's poor puss. D-Wave has succeeded in attracting bigname customers such as Google and Lockheed Martin Corp. But many scientists still doubt the long-term viability of D-Wave's technology, which has defied scientific understanding of quantum computing from the start.